Summary of Results Masses required for shielding are greatly dependent on mission requirements such as: dose requirements for the areas to be shielded, the size of the shielded areas and the payload separation distance from the reactor. The simplified algorithms discussed above, which were based on extensive Monte Carlo modeling, provide a first-guess estimate to use in preliminary system tradeoffs, so that a specific configuration can be chosen for further study. REFERENCES [1] Ride, S.K. (1987) Leadership and America’s Future in Space, NASA TM-89638, August. [2] Exploration Studies Technical Report, FY 1988 status. Vol. I: Technical Summary, and Vol. II: Study Approach and Results, NASA TM-4075-VOL-1; -2, 1988. [3] Soffer, L. & Clemons, L.C., Jr (1969) COHORT-II—A Monte Carlo General Purpose Shielding Computer Code, NASA TM X-52561. [4] Bloomfield, H.S. & Clemons, L.C., Jr (1969) Evaluation of the COHORT II Monte Carlo Shielding Code: gamma ray transport using source direction biasing, NASA TM X-1877. [5] Carlson, D. (1987) Los Alamos National Laboratory, personal communication. [6] Bloomfield, H.S. (1987) Small Space Reactor Power Systems for Unmanned Solar System Exploration Missions, NASA TM-100228. [7] Bloomfield, H.S. (1988) Nuclear reactor power systems for lunar and planetary bases, paper presented at the 2nd Symposium on Lunar Bases and Space Activities in the 21st Century, Houston, TX, 5-7, April, symposium paper No. LBS-88-251.
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